5) Which one of the glowing magnetic field gives the largest magnitude?
A: the field 2 cm away from a long, straight wire carrying a current of 3 A
B: the field at the center of a flat, compact, circular coil, 2 cm in radius, with 10 turns, carrying a current of 0.3 A
C: the field at the center of a solenoid 2 cm in radius and 200 cm long, with 1000 turns, carrying a current of 0.3A
D: the field at the center of a long, straight, metal bar, 2 cm in radius, carrying a current of 300 A
E: a field of 1 mT
A: the field 2 cm away from a long, straight wire carrying a current of 3 A
B: the field at the center of a flat, compact, circular coil, 2 cm in radius, with 10 turns, carrying a current of 0.3 A
C: the field at the center of a solenoid 2 cm in radius and 200 cm long, with 1000 turns, carrying a current of 0.3A
D: the field at the center of a long, straight, metal bar, 2 cm in radius, carrying a current of 300 A
E: a field of 1 mT
举一反三
- There is no magnetic field in an ideal conductor, but there is a magnetic field inside because of the surface current。
- When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is: A: 0.25 B: 0.50 C: 1 D: 2 E: 4
- The Biot-Savart Law is used to（ ） A: determine the magnetic field created by an electric current B: determine the electric field created by an electric current C: determine the force field created by an electric current D: determine the magnetic field created by individual point charges E: determine the electric field created by individual point charges
- Semiconductor<br/>with a current is placed in a magnetic field perpendicular to the<br/>current and it induced electric field in the direction. This<br/>phenomenon is known as the ______ .
- The<br/>Biot-Savart Law is used to A: determine<br/>the electric field created by individual point charges B: determine<br/>the electric field created by an electric current C: determine<br/>the magnetic field created by individual point charges D: determine<br/>the magnetic field created by an electric current E: determine<br/>the force field created by an electric current